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Update: Stem cell benefits getting closer

Many diseases involve the death of specialized cells that the body cannot naturally replace. A heart attack suddenly kills heart muscle cells. A stroke suddenly kills—and Alzheimer's disease slowly kills—brain cells. A perfect treatment would replace these lost cells, with cells exactly like them, but the body cannot do that on its own.

Daily Health Tip

Staying active with joint pain

It's important to keep joints moving, even if you're dealing with pain from arthritis or an overuse injury. Try these joint-friendly options for physical activity: an elliptical trainer; a stationary bike (recumbent or upright); tai chi; swimming, water aerobics, or water walking; a rowing machine; short walks throughout the day, instead of a long walk.